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-3- 10. The September 14, 1990 letter from the Colorado Division of Wildlife to the Weld County Department of Planning Services states that in Phase II, final shoreline slopes will be no greater than 4H:1V. Please respond as to whether this will be a commitment from Asphalt Paving, as page E-1 of the application states "Final sideslopes created in the lakes will be the accepted 3:1 and 2:1 configuration...". 11. Will shoreline slopes be mined to the proposed final gradients, or will the pits have nearly vertical sidewalls that will be backfilled to tinal grade? We would recommend mining to final grade and no steeper, as subaqueous backfilling of vertical walls can result in greater amounts of material being required to achieve the approved slope configuration. If the walls will be mined vertical and then backfilled, please describe a maximum length of vertical wall that will exist before being backfilled. This is necessary for the Division to more accurately determine a financial warranty amount. If walls are to be mined vertical and then backfilled, please also provide the amount of overburden necessary to achieve the final slope configurations. Remember that subaqueous deposition of fine grained materials will result in a portion of the material spreading out along the bottom of the lake, instead of piling up against the wall. The extra amount of material necessary to achieve a subaqueously-deposited slope may be on the order of two to three times that required for a slope constructed under dewatered or dry conditions. 12. You have stated that no discharge is anticipated from the property. It is thus assumed that no sediment settling ponds will be constructed. Is this correct? 13. You have estimated total annual water consumption at 91.5 acre-feet. You have also stated that to meet this consumptive requirement, you have secured the use of one share of stock in the Brighton Ditch Company. Please describe the yield of this share on a volume basis, as you must demonstrate whether the share can adequately meet consumptive needs. 14. Please address measures to be taken for surface sediment and drainage control for the disturbed area (berms, straw bales, silt fences, collection ditches, settling basins, etc.). If collection ditches are proposed, please provide engineering designs, representative cross sections, gradients, and expected water velocities. If settling basins are proposed, please provide engineered designs and representative cross sections. 15. Material is proposed to be stockpiled along the west bank of the South Platte River. Please commit to stockpiling these materials west of the Phase I pit, and, if possible, out of the 25-year flooaplain. As an alternative, please commit to replacing any materials stockpiled for reclamation that may be lost during hi9hwater events. Please verify that you will check with the U.S. Army Corps of Engineers for any necessary permits regarding stockpiling materials along the riverbank.